I think the Grand Seikos are specified at the same +/- 10 seconds a year accuracy as that Bulova. They use a slightly different approach though - it's a standard 32768 Hz xtal, but its thermally compensated. I don't know of any other watches that use a 262144 Hz xtal on its own, but there were some designs that used both a 32768 and 262244 Hz xtals and used the tracking between them for temperature compensation (I think this was used in some Seiko and ETA watches). The Bulova certainly has a great price for a watch of that spec.
I don't know of any watches that used an oscillator as high as 10 MHz - the highest clock I ever heard of in a watch was in a very limited edition Citizen that ran at 4 MHz, and which was specced at +/- 3 seconds a year without thermal compensation. Omega also made a high-frequency watch that I think ran at 2.4 MHz and had a +/- 5 seconds / year accuracy spec. Both of these used AT-cut xtals and suffered from rather poor battery life (about 1 year). Regards, Pete On Mon, Dec 19, 2011 at 1:47 PM, Perry Sandeen <sandee...@yahoo.com> wrote: > List, > > I saw an ad today for a Bulova Champlain Precisionist watch. It is supposed > to be accurate to + 10 seconds a year. What stood out in the as is that they > are using a 262,144 KHz crystal eight times the frequency commonly used. > > I don’t know if it is more accurate than the Seiko (?) discussed on the list > about a year ago, but it seems to be about USD $2,100 cheaper. Around USD > $600 or less depending on the model. Is a 10 MHz or so crystal on the > horizon? > > Regards, > > Perrier > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
